Though the castle itself has long since vanished from the visible landscape, its location remains marked on historical maps, appearing on both the first Ordnance Survey six-inch map from 1840 and the later 1903 edition. Today, visitors to this elevated spot will find no trace of the structure at ground level, yet the site continues to hold its place in the cartographic record of Ireland’s medieval past.

The castle’s strategic position on rising ground would have provided its inhabitants with excellent sightlines in all directions, a crucial defensive advantage in medieval Ireland. This choice of location was typical of Anglo-Norman fortifications throughout the region, where control of the high ground meant control of the surrounding territory. The grassland that now covers the site gives little indication of the stone walls and towers that once stood here, though the natural advantages of the location remain apparent to anyone who makes the climb.

While physical evidence of Williamstown Castle has been lost to time and the elements, its persistent inclusion on nineteenth and early twentieth-century maps speaks to its significance in the local historical landscape. The Ordnance Survey’s careful documentation of such sites, even when already ruined or disappeared, has preserved valuable information about Ireland’s network of medieval fortifications; places that might otherwise have been completely forgotten save for their names echoing in the local townlands.